Uncap conda-build

Author: domdfcoding

.github/workflows/conda_ci.yml

@@ -30,7 +30,6 @@ jobs:
         uses: conda-incubator/setup-miniconda@v2
         with:
           activate-environment: env
-          conda-build-version: 3.21.0
           python-version: "3.8"
           miniforge-variant: Mambaforge